Patent US3281618A successfully refreshed from Google Patents.
US3281618A
Expired / Lapsed
US
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Graticule lighting structure
Assignee: Tektronix Inc
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Filing: 1963-11-01
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Granted: 1966-10-25
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Expires: 1983-11-01
Abstract
No abstract record available.
Inventors
- 👤 Lloyd E Swedlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:27
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/32; G02B27/34; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/34; H01J29/86; H01J29/89; H01J2229/00; H01J2229/89; H01J2229/8901; H01J2229/8926
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
APPARATUS FOR ILLUMINATING AN INTERNAL GRATICULE SCALE OF A CATHODE RAY TUBE, COMPRISING: A CATHODE RAY TUBE ENVELOPE HAVING A LIGHT TRANSPARENT FACE PLATE PORTION AT ONE END OF SAID ENVELOPE; A GRATICULE SCALE FORMED ON THE INNER REAR SURFACE OF SAID FACE PLATE; A LIGHT GUIDE MEMBER OF LIGHT TRANSPARENT MATERIAL HAVING AN INDEX OF REFRACTION SIMILAR TO THAT OF SAID FACE PLATE; AND MEANS FOR SUPPORTING SAID LIGHT GUIDE MEMBER ADJACENT THE OUTER FRONT SURFACE OF SAID FACE PLATE TO ELIMINATE ANY AIR INTERFACE BETWEEN SAID FACE PLATE AND SAID LIGHT GUIDE MEMBER SO THAT LIGHT CAN BE TRANSMITTED FROM SAID LIGHT GUIDE MEMBER INTO SAID FACE PLATE THROUGH THE FRONT SURFACE THEREOF.
Claim 2
Dependent Claim
115 words
APPARATUS FOR ILLUMINATING AN INTERNAL GRATICULE SCALE OF A CATHODE RAY TUBE, COMPRISING: A CATHODE RAY TUBE ENVELOPE HAVING A LIGHT TRANSPARENT FACE PLATE PORTION AT ONE END OF SAID ENVELOPE; A GRATICULE SCALE FORMED ON THE INNER REAR SURFACE OF SAID FACE PLATE; A LIGHT GUIDE MEMBER OF LIGHT TRANSPARENT MATERIAL HAVING AN INDEX OF REFRACTION SIMILAR TO THAT OF SAID FACE PLATE; AND MEANS FOR SUPPORTING SAID LIGHT GUIDE MEMBER ADJACENT THE OUTER FRONT SURFACE OF SAID FACE PLATE TO ELIMINATE ANY AIR INTERFACE BETWEEN SAID FACE PLATE AND SAID LIGHT GUIDE MEMBER SO THAT LIGHT CAN BE TRANSMITTED FROM SAID LIGHT GUIDE MEMBER INTO SAID FACE PLATE THROUGH THE FRONT SURFACE THEREOF.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |